Hello.
I'm installing Shorewall on my hosted server.
I'm doing stuff step by step so I can understand what does what. I have
some trouble with Pings coming from private IP aliases.
The server has 2 IPs on its one interface
eth0
X.15.9.149
172.16.1.10
The shorewall config that matters is
/etc/shorewall/interfaces
net eth0 tcpflags,nosmurfs,logmartians=1,routefilter=1,sourceroute=0
/etc/shorewall/zones
fw firewall
net ipv4
/etc/shorewall/rules
...
Ping(ACCEPT) $FW net
...
When I do a
ping google-public-dns-a.google.com
it works an you can see the ICMP traffic in both directions
tcpdump -i eth0 | grep google-public-dns-a.google.com
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
21:08:33.138416 IP my.fqdn.me > google-public-dns-a.google.com: ICMP echo
request, id 9539, seq 1, length 64
21:08:33.160647 IP google-public-dns-a.google.com > my.fqdn.me: ICMP echo
reply, id 9539, seq 1, length 64
When I bind the ping to the internal IP address
ping -c1 -I 172.16.1.10 google-public-dns-a.google.com
it times out. And you only see ICMP traffic in one direction
tcpdump -i eth0 | grep google-public-dns-a.google.com
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
21:10:41.011189 IP 172.16.1.10 > google-public-dns-a.google.com: ICMP echo
request, id 9556, seq 1, length 64
I thought since 172.16.1.10 is on the firewall this should work too.
I guess I need another rule or masq or nat, right? I'm kindof unclear about
the right options in the interface's options too. What do I need to change
to make the
ping -c1 -I 172.16.1.10 google-public-dns-a.google.com
work right?
Dale Greenway
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